Get Knotted!

A piece of knotted string walks into a bar and orders a pint.
After having consumed 5 or 6 pints, the piece of string gets very stoned indeed.
The barman decides that the string is causing trouble and throws it out, at the same time giving it a damn good hiding, thus leaving it in a tattered heap on the ground.
The following day, after tidying itself up a bit, the piece of string walks into the same bar again, and asks for a pint.
The barman looks at the dishevelled piece of string, and says to it, "Hey, are you the piece of string that I threw out yesterday"?